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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc321edee5c0366f021bebae6c48e8c62614441216e02426608a18419adc3c80' 
  AND token = 'L9KL9QKqwuCNRHYO3txwiu80NCyf+7dgtM3xXwCj3OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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