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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23eb4f1c2d272caa2c9fead1297e37053c358dee898d7e9d281f677fb215c812' 
  AND token = 'WETYwC7onVRM67/+kp+lCMTmBU0Ow19pxoGMDhAJpsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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