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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0362d91962fc1a520a7790f3af8da1b41e1bd1e027fee303f241b71e331279b9' 
  AND token = 'bNMw4DmvM95TnWdzxws00SQKWOSDTylgieF61A/n5I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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