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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f81dc17a1243a67d7234bf6a229aae2704ac2ad3e7bdf94b80b69b5a0e696bd5' 
  AND token = 'J/tWzpJ95B5rt7IWOcSCoHbjwaM/gcQN0j4qmNEKpeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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