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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2724614ed4b9bc136485960e790bc598cc3dc6989935db66d6cd30f1e174b25e' 
  AND token = 'LYVg+A7EgitNQefXPrUMx3vvs3A36ZWMC7UpejFwpvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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