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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc0e7f1b92d7e2209dc2b5ae492137d3a00816a50147ab96169f609dfb2701e' 
  AND token = '2HYbL1MADXbSyf3ylNgzD6qrdu4GuFHd726zMkLXYNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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