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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e5c7fc95d94002d6d5eefa2effcf0363f2be660561c874254aa0e5819f3936' 
  AND token = '1Zl5osL6QcN1Tysh/PRu3nn51y7DLMvbekDNOqFD7Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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