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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810dbab847a0acee365a6c4760b37f213283700db2fc8df36f716878046be2a5' 
  AND token = 'jZmJWBbfcqL/t5uUA1r6hTYmu6ceYcuD5+yDO3OS9m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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