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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a02473b9c55d20c383fe9f104b804c24e7851f7c254d327eed3204883619ae4' 
  AND token = 'bzGmnIyAEEyzfPJZ8vZ7zc9k3TO6V6YlLO+IYRqHk8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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