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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f774868b963a0fc46f2a10548021978e1dd2a168bfe94ac1c196d22205c4b3dd' 
  AND token = '2WDLkkO0w63heKjLPOztoo69AQiPHpYiyHwWVZ5O4GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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