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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b282cef5152dd6128de8eff260300d5dfbf5e3f65697ab6b7f3c215271095b4' 
  AND token = 'jJgY6mwWoHKgoKFtirW2SYzEHGgvTS7Tnmrq6KpSrRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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