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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd199a85e761defdeb9f35ce2afb1c1e0ba4733753548bd42eb8aabdae6f619b8' 
  AND token = 'y8CV4gawLnX2H11BTdRzSXKSOwqMAx1PwPazps0KqEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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