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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880cc37e8ccc03728643311cacc38ed6d2249ee77147e796fcaeae452fa3ee59' 
  AND token = 'ZEv12SE4Qs3BXfBv856fZ+NYMYclHy2kf9yWBK49dbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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