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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b5f3a09a283a41c69d2c52dfb96b25fba554a0eaa7438c5c2139cd3c695be2' 
  AND token = 'mABRDxoD1PGI5o27PtbOYvA0lbOEBT7uvZleTX0reZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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