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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2f74c744cffbeb4025932ab4e0ff34733e9f82f2ffddedfc2c6340680831d6' 
  AND token = 'R8WDhCRT/Fel3svwFK5lBxjJCbaQRgExMbAu1CiqSG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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