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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2f89039baed7b12524db5b7bdf3de6884f29e05d12567b636276b99b8e7806' 
  AND token = 'vKJf7vZlx/8h09x7X5rbBhYojhE4SHx4ZongyxTpREE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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