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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac28ac870f5d7831c92694866c9f9197facf58c36c4853db299cc058fd3833d9' 
  AND token = 'SvNvZtEkpSO9ym/97IYDtkWky1Zp0e4heqzca2P3ras=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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