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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59d612925994f99aeeb0e98b4b7280d6168db46bb68a3301116b5ebcfc197a5' 
  AND token = 'n9HvZvj6K78tMZDcj+OfTYSBW/Xj9jb0Kqo1Y4AD2uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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