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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e36fa342c23c7aa52a4ab064b713f7c483504f5c667b9057c050797576ca549f' 
  AND token = 'KukTDaDh45NUk+j/X6O73AQuT8chQzVRsb1/AecvOkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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