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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9452d07ceecd03f82d4e00685de31cf45a6afc511fa8a2433df7b558c96943' 
  AND token = 'J+vLpJ6aHGjcHpTDRX0gosCLoa3w103a9dlXq+MNJ9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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