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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84df6bb29098ff957707cdd1135daf4d672f8e6a76fb5fa25012704795d119ab' 
  AND token = 'QwOjFh0p8rhYoSUT4pZOHM+AQdd0g4CaK1Naq/T9jZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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