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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f99b61dec56ea998ccf600f7fab3e7f84d54b1901080e61e4006a01e6023f4' 
  AND token = '/4ZbvyfL9FB5SyOUEdj1dvyBPFJVbZQ/AT06aluUNng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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