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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fcc4cb73988013e30b65f9df32d2759a3866c70105d9fe7c37d53e95c59068b' 
  AND token = 'dDEa8uLP33A2GKejwogOdPmJhTHjoh/K+fyyQd+X5Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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