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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc8c9c2b694ff478a0339f5ec55a39aedc6993819f3ecc6aec4aa88dbbf3429' 
  AND token = '7x8fgP5b8Uuiwwrwn+cE2828yfhTzOt8p7xwTjk8Cfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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