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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71542f6e57c4bb690ef0230ec5a9a4a8fe2a4d229c9ba7ef149489469d60b3de' 
  AND token = 'pa2ycSEWfbD4UqSluKJstX8H+XB0JSy7jxslbfr/vCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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