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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c8093c214f5cb6c0e6d852d2e3bdae9cbd9be9880dbfd8f1b8da3f4f79a237' 
  AND token = 'k3+4N7i85BKEJ8y5LQ9a3YovRiZpMzyD4uMnE0Dno+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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