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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '604a106e6b4f07292cee3b77a7ac35e4d4b729aff5ac7401a4e8146a1bd60df1' 
  AND token = 'YbLj6+x+2yiA+ZfoqZZq7ADzWYnJYMl7z/CPrRfpFfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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