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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7779878dca92c9519d1f71504586b8c94fcabab3e7b437992ce33296b69040' 
  AND token = 'scWVRZS6Vx/G1DGLkgewn3B9Wbb4XeTWXV0fjpWi138=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}