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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09eb558a16863657e512c335902d37600b53c7f24d27bd06cd782765a4af25e' 
  AND token = '5zrM5TtethfwmLdtETKXeFyKIC7GLhalkLcisbLS4KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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