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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae8007087267a0f7b1a12410ce7844c4bc6679d55b7a474c707a595808c9695' 
  AND token = 'toykAcE8l7lGhEZd3qkKtlI1BiZ5vcfAZLN2dAJASuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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