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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c8a4340036f2b4898dd37656666ba7b995b5953b51ec7fde7ed0925bd87206' 
  AND token = '6bDFyhthE7kwAzFm1G5QifYGcH7E2V7M/H6gvt4uFvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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