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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171ae97a0baef471d160614255cc6de02989b8bcbc48b8721b11068781eb3bc3' 
  AND token = 'irknUPY3KRc+SKW++ZHLliHeVm5PfXfA74BDB94ISd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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