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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94f73f10a76e26f0caff81a5621fdfe052040696af4b74387f2fddb2d4f2aac' 
  AND token = 'GFK3aTmxrZ5+ZOdyYdD2lGEHoDx9Ypa5/nkqq7Rv/vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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