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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4799b2b24a3554e31da067d556a5b0173fe9ff06c0b634cda38a932b61e10f2' 
  AND token = 'b8toRfwLRF9e2/xkKgn0vq9Ru0WvHwMPEifOby8PUFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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