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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2f2bdac650b5277b7a6e26ea312e2d306d821298729b38f2199befb5dc8508' 
  AND token = '3piGtBjHUO6xtEJgoisS9AiTx31G/IR6G9f2YgOxGYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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