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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '499660da32f2d4eb267349232fc4075780dd3897d8c4465af197bebbc43aeab9' 
  AND token = '24UAaOo36owarFaXV5Ytvw/4PUoiTwvBAfakCS2ERec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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