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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baacff90d7be04f51710089c5476814edad44376a75775e276a4edd0aaa8e49a' 
  AND token = 'LBpu5eJFQ0lXoX3MR1T9UkdOqC/MhQhwo9g+fWTjCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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