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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8c6fc3eafdda1374a328f238d1b5e8806d2353060b28a08b78e2c29c39a6a2' 
  AND token = 'hzDsNuqo2CpBDV4o/eC/xJaCZkeDxMhbe3lNf7AZNwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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