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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '688031f66dc8f54beaedb165fa4cb06ce612470e3fc4d343d6eecd12f3f99f94' 
  AND token = 'JclR+4Fpge8Zm0wPV1A7EsZzE2xBQO144KDc47zEZYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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