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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2504843c224ead1c8d1b5fc76bded8e564dc195ce297aacfc9d756c6a18f73d2' 
  AND token = '1ohSAfXRT9ft/EIyr4L6cg/NUjZO6K8zgsJE2TPBKWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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