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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f683d71d2f1ba6d3bfad4ed58790f3a8348daa73fa0d6113eb3c799a360c7417' 
  AND token = '8XmGLLpxIAO2FUht1d8FQt4vMEIpop2P89RdtC82AIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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