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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7841246a0653074ec9ca1563260c7cc8adf42d43c6d71c92f381e1091aa5cf31' 
  AND token = 'SvSxmLjnChXGDb43Q2NPuqfHeTUiV2FCadWJIm4sCz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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