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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2ca425f5b8ceceb066b83645359bc9e9dc07c65c6ae5f58b1a7f0f87c71ac0' 
  AND token = '73uwx5EcM29BKfGvUQe0fL51be3MlD1T9jP/FXoRI6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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