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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf3ac3cc06c302800411dadc944727a537c13762849ce7ae8d815f937bece60' 
  AND token = 'AyRpUu6dyvlthupphNWN7meRq+UFhy3o1iv+2bjJ5m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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