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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaea685918713e7058e6ebe4e5daa264d32494b188f28d08e8ee4b992ad295d' 
  AND token = '6Il7oI1O+jTTaT91aykHsLMSa0dHMX26W/nzAMdBTPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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