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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a643a431ff2c86c41ff3301ff9e4a56416f93e0f8067eb102d6a861d8622710f' 
  AND token = 'Qi0Dztc7NSiGj8tif6s9BJmWs6sEypBu/zuO//Y69SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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