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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fe486cc6a17fbc01741ee5cca6333040217a83241a9eac6b014b0dcd154b98' 
  AND token = 'L19a8con0s4DqkY5caoDGhtbozjB8xHYclSxlROs3hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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