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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce2fed5939cc5bcd9f98b6ef332e2bd221c925f6ba6ab4e0d23b96714bc9db5' 
  AND token = 'qGI329oM8g3v73/hbsjIs3Obh1s6dU0H59w4oW6wZ6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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