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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cde2fb97689b785784776a10fecdeb826c8c2f229a67a53f35fc70fdaa8147' 
  AND token = 'RDNnMHdfXa2Z6TiDsMiG2RgOJs5mYJHlqi1Tvrf6oFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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