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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149f0e3a2935a7c91a631d9a865346c88ae7f5bdc697df299c5dad817bf01f50' 
  AND token = 'crDKvhp3160q32WDUx9uGtDhzSXJHDyKqyqSk4tbvMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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