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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbbd11772ba3e9fee82bb0bda0d8d71e22e5ce7595a7d5d03105012e4e11b574' 
  AND token = '08l1fX6pMpngiZU+XYSiEEKxcGa6mZCCXFh8qNwWMqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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