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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070c1b537f843883ea5ebdd21b954843a0196ff50f49d0a6368929c28ccaf2e5' 
  AND token = 'Jlbu+BCTyUQTvO9/Su9SytwPtfWlRo35RsclfX1xy8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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