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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f504bca29f3d0da9496b999e59159c8dec30961c05bc30aa9b5bde57bfad4037' 
  AND token = 'AQBso8Zawv/I19TuehFfUppIn9PB2c+9xGwwTYbTN8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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