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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dff2aca20fff6ac339a49e76ede24aa323f68e86ae2c49564444b6d1a1f6ec1' 
  AND token = 'LeUxGXiigILJoztqP6d2vMDYov+Iak51n/6Xm9V+4Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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