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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a0866cf2cc7f0c3a8fa9f050fadf29a39d074c246821e91dc2126f79b20e91' 
  AND token = '2QMGv0rJlPBn/g9RIjQHu8dvRxw2PCDRGcME2PWIe1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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