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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8599cfa42c899ad7b7e11d41318824c1a88cf98c57f79d286a4ab205c16a7f' 
  AND token = 'mG9aiLIqjnfnehfxZ8CItQqkbro2DTj0MTKRUGM+7vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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