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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65acf8a433cc28ad9008aa338a4703d6681334e4800ed767b7d0250a59616f1f' 
  AND token = 'vwIUyTsN9G0wP7totrKdCCoPA0fwXCKZIfitJ3IB8ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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