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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6440904f60277979fbcf922384f3b169cd3d746870235922fc4eaf9b818d7593' 
  AND token = '7xcOl3hqLvUoN8GNPLp9cJm9F7ZU1VL7vskbjkjCB1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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