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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5bfa66908a25d75ba4463da7d80f445a7684356cb9ddb4b8afaae7c5ab59f5' 
  AND token = '8VklGvgq45Na5BrM+w3H+XjMtQ9w3SjQ5C3y6xjlKD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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