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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af54cd9fabad715c0883948f21d2b17cb8cb56d30207d5fcef59b0ef88d0a46c' 
  AND token = 'A+7WazUwq2MG4Ki6AokAKDfkbqYhtYs6aWpE0Yo0WgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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