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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293e8771101373c1ab3c12cc60a3fdba9403d0e41399595c1ae9255595f78b8e' 
  AND token = 'BZGVi1dqjtvh6RLFIU3cQsHE342jR50f1+i7yVOZC7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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