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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feca5893983dd2f72900ecd9f9b03e9bd5d1fc0b04a0a13a18a68675df4a029a' 
  AND token = 'c7Tw8s7tmqOvKHjRckhghSo6wAbyjQ6GU9qmYu0VoeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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