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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be26f518923da7570edf1d7152f668841e7520002dd838987467235a423b8007' 
  AND token = 'xej6QT2SQRsHxo+LphW01nmHmBj/Un/4vQKP3JY5Wmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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