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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89b2d7d3fd517a25076bc2161fab718c9ab810d9d8260c81e2424348480f3d7' 
  AND token = 'TWfMXYMTS7DLsMExUQiS7p/71O8LUcyV9mcmZRbOuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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