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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5708335d535f0f5f4946f6806c63a9738c5f26f0549f41bbc83924a07c21f5' 
  AND token = 'N4OJsng7TLqft6SSv1oUfIGaN+GrK8QJmcVfmbygwOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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