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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9962a5315a108611dde2a9e20edcf96d36fb5a66a0058912e2cc84ed2eaa0ded' 
  AND token = '0txNb2SC34x1M5msUZnxfqtxI26CkRKQl4IEXFAtr78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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