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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d1da9ebe3d96c08c69766df00cb67b4484a8ba8b3d161f3f16fb8c93359cad' 
  AND token = 'QNZ3bfq+hWsYhwRMGpamkWTh4nIe9tN14zuvz8Zj2ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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